Cell Phone Detector aka Mobile Bug

P. Marian - 01/25/09

This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence [...]

Ultrasonic Dog Repeller Circuit

P. Marian - 04/14/08

This ultrasonic dog repeller circuit will chase away angry dogs. It is build with the all known 555 [...]
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